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                ## [構造器初始化](https://lingcoder.gitee.io/onjava8/#/book/06-Housekeeping?id=%e6%9e%84%e9%80%a0%e5%99%a8%e5%88%9d%e5%a7%8b%e5%8c%96) 可以用構造器進行初始化,這種方式給了你更大的靈活性,因為你可以在運行時調用方法進行初始化。但是,這無法阻止自動初始化的進行,他會在構造器被調用之前發生。因此,如果使用如下代碼: ~~~ // housekeeping/Counter.java public class Counter { int i; Counter() { i = 7; } // ... } ~~~ **i**首先會被初始化為**0**,然后變為**7**。對于所有的基本類型和引用,包括在定義時已明確指定初值的變量,這種情況都是成立的。因此,編譯器不會強制你一定要在構造器的某個地方或在使用它們之前初始化元素——初始化早已得到了保證。,
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